glxgears corruption on gc400lt

[Kyle Russell]

Hello,

I'm trying to use etnadrm from xf86-video-armada and the etnaviv driver
from the 5.4.90 kernel with Xorg 1.20.8 and mesa 20.0.2, but occasionally
glxgears displays corrupt output.  When corruption occurs, it lasts for the
duration of the boot cycle.  On other boots, glxgears displays fine, though
it's very inconsistent.  The corruption is not static.  The triangular
shapes seem to correspond to the colors of the gears, and appear to rapidly
"dance" in the window.  Sometimes faint shadows of the gears can be
detected behind the corrupted region.

We're having trouble pinpointing the cause or pattern as to when the
corruption will occur.  I wondered if there's anyone who has encountered
similar corruption with this stack who might be able to give us some
pointers.

https://imgur.com/jQIU1TJ

Thanks,

Kyle
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